Differential Housing Windows for Cooling in Compact Powertrains
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Solution Overview
Problem
Conventional differentials face challenges in balancing bearing capability, cooling effect, and volume miniaturization, as they generate heat and require effective cooling and lubrication to prevent damage from excessive temperature and ensure performance.
Innovation Solution
A differential design featuring a housing with three planetary gears, two side gears, and strategically located windows for coolant inflow and outflow, allowing for active lubrication and cooling while minimizing housing volume, enhancing structural strength and bearing capability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the housing volume is reduced for miniaturization, then the bearing capability and cooling effect deteriorate
Solution Approach 1:
The patent applies local quality by strategically positioning windows at specific locations on the housing where they can provide optimal cooling and lubrication to the planetary gears and side gears. The windows are located to allow coolant to flow directly to the gear meshing areas, ensuring that cooling effectiveness is concentrated where heat generation is highest, thus maintaining reliability without requiring increased housing volume.
Solution Approach 2:
The patent utilizes the rotational motion of the differential housing to create dynamic cooling and lubrication. As the housing rotates, the windows continuously expose different portions of the internal components to coolant flow, ensuring that all gear surfaces receive periodic cooling and lubrication. This dynamic approach allows effective thermal management in a compact design without requiring larger housing or multiple static cooling channels.
2Reliability
If more planetary gears are added to improve bearing capability, then the housing volume and heat generation increase
Solution Approach 1:
The patent combines multiple functions into the existing housing structure by integrating cooling windows and lubrication channels directly into the housing walls. This merging of cooling, lubrication, and structural support functions allows the housing to accommodate three planetary gears and two side gears with adequate bearing capability while maintaining a compact volume. The windows serve dual purposes of structural reinforcement and thermal management.
Solution Approach 2:
The patent addresses the volume-bearing capability contradiction by utilizing the three-dimensional space efficiently. The windows are positioned to exploit the radial and axial dimensions of the housing, allowing coolant to access gear surfaces from multiple directions. This multi-dimensional cooling approach enables effective thermal management with a compact housing volume, avoiding the need to increase size to accommodate additional planetary gears.
3Temperature
If a cooling window is added for cooling effect, then the structural strength and bearing capability deteriorate
Solution Approach 1:
The patent employs strategically positioned windows in the housing that are designed to minimize structural compromise while maximizing cooling effectiveness. The windows are located in regions where the housing walls can maintain adequate thickness for structural strength, and their positioning is optimized to provide cooling without creating weak points that would compromise the housing's ability to support the planetary gears and transmit loads.
Solution Approach 2:
The housing is designed with pre-positioned windows that are optimally located during the design phase to achieve the best balance between cooling effectiveness and structural strength. The window positions are predetermined to allow coolant flow to the hottest areas while maintaining structural integrity, eliminating the need for additional reinforcement that would increase housing volume.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design improves the differential's bearing capability, reduces wear, extends service life, and ensures secure operation by effectively cooling and lubricating internal components, meeting requirements for both performance and miniaturization.
Implementation Method 1
the coolant may lubricate or cool the three planetary gears and the two side gears inside the housing of the differential through the at least one window for inflow or outflow
Implementation Method 2
components including a plurality of gears, a gear shaft, a pin shaft, and the like are disposed inside the differential. When the differential is working, components that are in contact with each other or are coupled to each other generate heat through friction
Data Source
AI summary
This application describes examples of a differential device, a powertrain, and a vehicle. In one example, the differential device includes a housing, three planetary gears, two side gears, and at least one window. Each of the three planetary gears is mounted on an inner wall of the housing through a pin shaft, the three planetary gears are disposed spaced from each other along a circumferential direction of the housing. The two side gears are disposed on two sides of the three planetary gears along the axial direction of the housing and meshed with the three planetary gears. The main reduction gear drives the housing to rotate around the axial direction of the housing, so that the three planetary gears drive the two side gears to drive two drive shafts respectively.